What should I buy? (I'm still awkward with informal speech because I just signed up ㅠㅠ) Please give me some recommendations. I searched roughly and it said something like "Derma". Does it really work if I apply it? It hasn't even been a month yet. Is it okay to start applying it now? I heard that you can buy it at a pharmacy instead of buying it directly. Is this also salty? Please give me some recommendations~